Mark joined Defenders of Wildlife in 2013 after working 15 years in the American West to conserve fish and wildlife on public lands. He has spoken and published extensively on species and landscape conservation, particularly arid ecosystems managed by the Bureau of Land Management. He is a recognized expert on sage-grouse  and the Sagebrush Sea and leads Defenders’ efforts to conserve this focal species and focal landscape . He also works with fellow staff, partners and diverse constituencies to improve federal public lands management through policy reforms, Congressional direction, annual appropriations and litigation. A native Oregonian, Mark earned both his undergraduate and law degrees from the University of Oregon.